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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3afb741442ac77ff0754a8a56ddd34ac5e311d8f3e1992e62782e85bf67996' 
  AND token = 'zKJUTaleZ9xL7vG4wC0TXlg6H2f1omtA+eV83ArLmsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}